Buggy code:
public class HadoopUtils { public static String COMMON_FILE_DATE_PATTERN = "yyyy-MM-dd-HH-mm" ; public static String COMMON_FILE_DATE_REGEX = "\\d{4}-\\d{2}-\\d{2}-\\d{2}-\\d{2}" ; private static Logger logger = Logger . getLogger ( HadoopUtils . class ) ; private static Object cachedSerializable = null ; public static FileSystem getFileSystem ( Props props ) { } public static FileSystem getFileSystem ( String user ) { } public static < T extends Serializable > void setSerializableInCache ( JobConf job , T serializable ) { } public static Path getFilePathFromDistributedCache ( String filename , Configuration conf ) throws IOException { } public static FileInputStream getFileInputStream ( String filename , Configuration conf ) { } public static Object readSerializableFromCache ( Configuration conf ) { } public static Map < String , String > getMetadataFromSequenceFile ( String fileName ) { } public static Map < String , String > getMetadataFromSequenceFile ( FileSystem fs , String fileName ) { } public static Map < String , String > getMetadataFromSequenceFile ( FileSystem fs , Path path ) { } public static JsonSchema getSchemaFromPath ( Path path ) throws IOException { } public static JsonSchema getSchemaFromPath ( FileSystem fs , Path path ) throws IOException { } public static JsonSchema getSchemaFromPath ( FileSystem fs , Path path , boolean checkSameSchema ) throws IOException { } public static String getRequiredString ( Configuration conf , String name ) { } public static int getRequiredInt ( Configuration conf , String name ) { } public static void copyInProps ( Props props , Configuration conf , String ... keys ) { } public static void copyInRequiredProps ( Props props , Configuration conf , String ... keys ) { } public static void copyInAllProps ( Props props , Configuration conf ) { } public static Props loadHadoopProps ( Props parent , File hadoopConfDir ) { } public static void setPropsInJob ( Configuration conf , Props props ) { } public static Props getPropsFromJob ( Configuration conf ) { String propsString = conf . get ( "azkaban.props" ) ; if ( propsString == null ) throw new UndefinedPropertyException ( "The<seq2seq4repair_space>required<seq2seq4repair_space>property<seq2seq4repair_space>azkaban.props<seq2seq4repair_space>was<seq2seq4repair_space>not<seq2seq4repair_space>found<seq2seq4repair_space>in<seq2seq4repair_space>the<seq2seq4repair_space>Configuration." ) ; try { ByteArrayInputStream input = new ByteArrayInputStream ( propsString . getBytes ( "UTF-8" ) ) ; Properties properties = new Properties ( ) ; properties . load ( input ) ; <START_BUG> return new Props ( null , properties ) ; <END_BUG> } catch ( IOException e ) { throw new RuntimeException ( "This<seq2seq4repair_space>is<seq2seq4repair_space>not<seq2seq4repair_space>possible!" , e ) ; } } public static Cluster readCluster ( String clusterFile , Configuration conf ) throws IOException { } public static StoreDefinition readStoreDef ( String storeFile , String storeName , Configuration conf ) throws IOException { } public static String getFileFromCache ( Configuration conf , String fileName ) throws IOException { } public static String getFileFromURIList ( URI [ ] uris , String fileName ) throws IOException { } public static String getFileFromPathList ( Path [ ] pathList , String fileName ) { } public static String findContainingJar ( Class my_class , ClassLoader loader ) { } public static List < String > getFileNames ( FileStatus [ ] statuses ) { } public static String findContainingJar ( String fileName , ClassLoader loader ) { } public static String printAllClassLoaderPaths ( String fileName , ClassLoader loader ) { } public static Period parsePeriod ( String periodStr ) { } public static FileSystem getFileSystem ( String hdfsUrl , boolean isLocal ) throws IOException { } public static List < String > getLowestLevelDirectories ( FileSystem fs , Path directory , PathFilter pathFilter ) throws IOException { } private static boolean hasSubDirectories ( FileSystem fs , Path directory ) throws IOException { } public static JobConf addAllSubPaths ( JobConf conf , Path path ) throws IOException { } public static boolean shouldPathBeIgnored ( Path path ) throws IOException { } public static Map < String , String > getMapByPrefix ( Configuration conf , String prefix ) { } public static void saveProps ( Props props , String file ) throws IOException { } public static void saveProps ( FileSystem fs , Props props , String file ) throws IOException { } public static String readAsString ( Path path ) { } public static boolean mkdirs ( String pathName ) throws IOException { } public static void deletePathIfExists ( JobConf conf , String stepOutputPath ) throws IOException { } public static void appendTag ( BytesWritable writable , int tag ) { } public static int readTag ( BytesWritable readable ) { } public static Object createDefaultData ( Object typeSchema ) { } private static Object createDefaultJsonData ( JsonTypes type ) { } public static Path getLatestVersionedPath ( FileSystem fs , Path directory , String acceptRegex ) throws IOException { } public static Path getLatestVersionedPath ( FileSystem fs , Path directory ) throws IOException { } public static Path getSanitizedPath ( FileSystem fs , Path directory , String acceptRegex ) throws IOException { } public static Path getSanitizedPath ( Path path ) throws IOException { } public static Path getSanitizedPath ( FileSystem fs , Path directory ) throws IOException { } public static void cleanupOlderVersions ( FileSystem fs , Path directory , final String acceptRegex , int backupNumber ) throws IOException { } public static void cleanupOlderVersions ( FileSystem fs , Path directory , int backupNumber ) throws IOException { } public static void move ( FileSystem fs , Path from , Path to ) throws IOException { } public static void replaceFile ( FileSystem fs , Path from , Path to , Path temp ) throws IOException { } }

Fix:
return new Props ( properties ) ;